Eraser cleaning apparatus



July 29, 1941. w. A. SCHAFFER ERASER CLEANING APPARATUS Filed Jan. 7, 1941 2 Sheets-Sheet, J,

A Norm y July 29, 1-941. 'w. A. SCHAFFER' 2,251,069

4 ERASER CLEANING APPARATUS lllllh Ill/J "ll 2 f/I/l/lly Patented July 29, 1941 UHTE STATES OFFICE 1 Claim.

This invention relates to new and useful im-' chalk dust from the eraser and displace the same to a point where it cannot be readily breathed in by the person operating the apparatus.

Another important object of the invention is to provide an eraser cleaning apparatus of the character stated which in operation will be positive acting and in construction durable.

These and other objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a side elevational View of the apparatus.

Figure '2 is a front elevational view.

Figure 3 is a fragmentary vertical sectional View taken substantially on line 33 of Figure 2.

Figure 4 is an outside elevational View of the rotor.

Figure 5 is an inside elevational View of the rotor.

Figure 6 is an edge elevational view of the rotor.

Figure 7 is a fragmentary perspective view of the cleaner cleats.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes a base upon which a motor 6 is mounted. Extending from one end of the housing of this motor '6 is an outwardly flaring shell 1 which is secured to the back wall 8 of a cylindrical housing 9 by machine screws It]. This housing 9 has a removable front wall ll having an opening l2 therein of a size to accommodate a blackboard eraser.

Numeral I3 denotes a rotor mounted within the housing 9 and which is mounted on the outer reduced end 14 of the armature shaft [5 of the motor 6. The rotor [3 consists of a hub IE to one end of which is secured the substantially large disk I! and laterally from which extend blades l8 each of which at one longitudinal edge thereof is secured to or formed with the disk H.

The disk IT has openings [9 therethrough adjacent the hub it while on the front side of the disk and arranged in radial rows are cleats 20. Each arrangement of these cleats consists of a pair of rows of these cleats 20 with the cleats of the two rows in laterally offset relation to each other.

Obviously when an eraser is placed in the opening l2 a sweeper sweeps up the cleat 20 where removed soft dust from the eraser and the soft dust can readily settle through and pass to the individual cleats 20 to reach the openings I9 through which the dust is drawn by blades 18 and expelled through the exhaust or outlet 2|.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described the invention what is claimed as new is:

An eraser cleaning apparatus comprising a housing, a drive shaft extending into the housing, a hub carried by the end portion of the drive shaft located within the housing, a disk carried by the outer end of the hub, radially disposed blades projecting from the hub and at the inner side of the disk, said disk having dust passing openings therein and provided with cleats at the outer side thereof, said housing being provided with a removable cover plate having a rectangular-shaped eraser receiving opening therein behind which pass the cleats, and a dust outlet for the housing.

WALTER A. SCHAFFER. 

